HTTP protocol checker
Reports the HTTP protocol actually negotiated for this connection - HTTP/1.1 or HTTP/2 - and any Alt-Svc advertisement of HTTP/3.
1 · Input
What is checked
The HTTP version this connection actually negotiated - HTTP/1.1 or HTTP/2 - read directly from the response, not guessed. The server's Alt-Svc header is also checked for an h3 advertisement, a real (if indirect) signal of HTTP/3 support.
HTTP/3 is honestly out of reach for this checker
This checker's server-side HTTP client has no QUIC support, so it can never itself confirm or rule out HTTP/3 by connecting directly - that result is always reported as Not Tested rather than a false "not supported."
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